base: Add support for changing output directories

This changeset adds support for changing the simulator output
directory. This can be useful when the simulation goes through several
stages (e.g., a warming phase, a simulation phase, and a verification
phase) since it allows the output from each stage to be located in a
different directory. Relocation is done by calling core.setOutputDir()
from Python or simout.setOutputDirectory() from C++.

This change affects several parts of the design of the gem5's output
subsystem. First, files returned by an OutputDirectory instance (e.g.,
simout) are of the type OutputStream instead of a std::ostream. This
allows us to do some more book keeping and control re-opening of files
when the output directory is changed. Second, new subdirectories are
OutputDirectory instances, which should be used to create files in
that sub-directory.

Signed-off-by: Andreas Sandberg <andreas@sandberg.pp.se>
[sascha.bischoff@arm.com: Rebased patches onto a newer gem5 version]
Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>

1 files changed, 1 insertions, 3 deletions

diff --git a/src/cpu/base.cc b/src/cpu/base.cc
index 0e8c2930f..22fca4dc5 100644
--- a/src/cpu/base.cc
+++ b/src/cpu/base.cc
@@ -218,9 +218,7 @@ BaseCPU::BaseCPU(Params *p, bool is_checker)
     functionTracingEnabled = false;
     if (p->function_trace) {
         const string fname = csprintf("ftrace.%s", name());
-        functionTraceStream = simout.find(fname);
-        if (!functionTraceStream)
-            functionTraceStream = simout.create(fname);
+        functionTraceStream = simout.findOrCreate(fname)->stream();
 
         currentFunctionStart = currentFunctionEnd = 0;
         functionEntryTick = p->function_trace_start;